代码如下：

try
{
//备份数据库
       string strg = Application.StartupPath.ToString();
       strg = strg.Substring(0, strg.LastIndexOf("\"));
       strg = strg.Substring(0, strg.LastIndexOf("\"));
       strg += @"Data";
       string sqltxt = @"BACKUP DATABASE db_MrCy TO Disk='" + strg + "\" + txtpath.Text +".bak"+ "'";
       SqlConnection conn = BaseClass.DBConn.CyCon();
       conn.Open();
       SqlCommand cmd = new SqlCommand(sqltxt, conn);
       cmd.ExecuteNonQuery();
       conn.Close();
       if (MessageBox.Show("备份成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation) == DialogResult.OK)
       {
           this.Close();
       }
   }
   catch (Exception ex)
   {
       MessageBox.Show(ex.Message.ToString());
   }

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